ࡱ> kmj7 bjbjUU 7|7|D l, ,2   $ f 9" Q  Q Q Q B Q  Q 0Q   cd,;  02 n; n Q ,, Sistemul circulator Sistemul ciculator este format din inim, vasele sangvine _i limfatice care alctuiesc o unitate funccional coordonat _i permanent adaptat nevoilor organismului. Inima Inima este un organ musculos,cavitar, tetracameral, care pompeay ritmic n artere sngele pe care l primeste prin vene. De_i la om cntre_te aproximativ 300 g _i are mrimea pumnului unui adult, inima efectueaz o activitate uria_, zilnic contractndu-se de peste 100000 de ori _i pompnd peste 7200 de l de snge. Seccionnd inima, se constat c este construit din dou atrii _i dou ventricule, separate complet prin septurile interatrial _i iterventricular. Fiecare atriu comunic cu ventriculul respectiv prin orificiile atrio-ventriculare prevzute cu valve, care se deschid doar intr-un anumit sens, spre venticule: stng (biscupid) _i drept (triscupid). Structura histologic a inimii Inima este alctuit din tei straturi concentrice: endocard, miocard _i epicard. Endocardul este constituit dintr-un endoteliu situat pe o membran bazal ce se continu cu stratul subendotelial, format din fibre colagene, fibre de reticulin, fibre elastice, rare celule conjuctive _i numeroase terminacii nervoase senzitive. Miocardul este constituit din fascicule de fibre musculare cardiace, orientate circular n peretele atriilor, _i din fibre oblic-spiralate n ventricule. In peretele inimii. n afara celulelo miocardice, mai exist celule specializate n generarea _i conducerea impulsulilor de contraccie acestea constituie cesutul excitoconductor nodal. Epicardul este o membran epitelio-conjuctiv subcire ce acoper suprafaca cardiac _i constituie foica visceral a pericardului. ntre foicele pericardului se gse_te cavitatea pericardic cu olam subcire de lichid, care favorizeaz alunecarea n timpulactivitacii cardiace. Vascularizacia inimii, extrem de bogat este asigurat de cele dou artere coronare care se desprind de la originea aortei _i se mpart n ramuri care nu se anastomozeaz ntre ele.Obstruccia unei coronare sau a ramurilor sale provoac necroza teritoriului cardiac deservit. Inervacia extrinsec a inimii este realizat prin fibre vegetative simpatice _i parasimpatice formnd plexul cardiac. Fibrele simpatice provin din ganglionii paravertebrali cervicali _i exercit efecte stimulatoare asupra miocardului _i vasodilatatoare coronariene. Fibrele parasimpatice provin din nervii vagi, nerveazpredominant nodulii sinoatrial _i atrioventricular _i au ca efect diminuarea activitacii cordului. Proprietacile mu_chiului cardiac Miocardul care din punct de vedere structural este un mu_chi striat are proprietaci comune cu mu_chii striaci, dar _i o serie de proprietci caracteristice. -Ritmicitatea este proprietatea cordului de a se contracta succesiv ca urmare a impulsurilor contracciile generate de nodul sinoatrial. Aceste impulsuri sunt urmarea unor modificri metabolice care au loc n sistemul excitoconductor. -Conductibilitatea este proprietatea miocardului n specil a cesutului nodal de a conduce unde de contraccie de la nivelul nodului sinoatrial n ntreg cordul. -Excitabilitatea este proprietatea miocardului de a rspunde printr-o contraccie la stimuli adecvaci. -Contractilitatea este proprietatea miocardului de a se contracta atuci cnd este stimulat adecvat. Contracciile miocardului se numesc sistole iar relaxrile diastole. *0z   68JbNRl(Jj8XDRr6B*CJ$ph B*CJ$ph6B*CJ$phCJ$mH sH  6B*ph6B*CJ$mHphsH56B*CJ$mHphsH5B*CJ$mHphsHCJ(jUmHnHu5 CJ$mHsH5CJ,CJ,$*,.0z   8bN$f4`$a$`$a$$a$(&P . 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